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Note 3 - Inventory - Summary of Inventory (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Furnace parts and supplies	$ 53,969	$ 55,177
Raw materials	3,253,365	3,301,526
Work in process	1,415,130	1,271,458
Finished goods and filtration systems	1,579,779	1,507,113
Reserve for obsolescence	(792,354)	(867,458)
Net Inventory	$ 5,509,889	$ 5,267,816

X

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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